#NAME

Pie - A writer class for Excel Pie charts.

#SYNOPSIS

To create a simple Excel file with a Pie chart using Spreadsheet::WriteExcel:

#!/usr/bin/perl -w

use strict;
use Spreadsheet::WriteExcel;

my $workbook  = Spreadsheet::WriteExcel->new( 'chart.xls' );
my $worksheet = $workbook->add_worksheet();

my $chart     = $workbook->add_chart( type => 'pie' );

# Configure the chart.
$chart->add_series(
    categories => '=Sheet1!$A$2:$A$7',
    values     => '=Sheet1!$B$2:$B$7',
);

# Add the worksheet data the chart refers to.
my $data = [
    [ 'Category', 2, 3, 4, 5, 6, 7 ],
    [ 'Value',    1, 4, 5, 2, 1, 5 ],
];

$worksheet->write( 'A1', $data );

__END__

#DESCRIPTION

This module implements Pie charts for Spreadsheet::WriteExcel. The chart object is created via the Workbook add_chart() method:

my $chart = $workbook->add_chart( type => 'pie' );

Once the object is created it can be configured via the following methods that are common to all chart classes:

$chart->add_series();
$chart->set_title();

These methods are explained in detail in Spreadsheet::WriteExcel::Chart. Class specific methods or settings, if any, are explained below.

#Pie Chart Methods

There aren't currently any pie chart specific methods. See the TODO section of Spreadsheet::WriteExcel::Chart.

A Pie chart doesn't have an X or Y axis so the following common chart methods are ignored.

$chart->set_x_axis();
$chart->set_y_axis();

#EXAMPLE

Here is a complete example that demonstrates most of the available features when creating a chart.

#!/usr/bin/perl -w

use strict;
use Spreadsheet::WriteExcel;

my $workbook  = Spreadsheet::WriteExcel->new( 'chart_pie.xls' );
my $worksheet = $workbook->add_worksheet();
my $bold      = $workbook->add_format( bold => 1 );

# Add the worksheet data that the charts will refer to.
my $headings = [ 'Category', 'Values' ];
my $data = [
    [ 'Apple', 'Cherry', 'Pecan' ],
    [ 60,       30,       10     ],
];

$worksheet->write( 'A1', $headings, $bold );
$worksheet->write( 'A2', $data );

# Create a new chart object. In this case an embedded chart.
my $chart = $workbook->add_chart( type => 'pie', embedded => 1 );

# Configure the series.
$chart->add_series(
    name       => 'Pie sales data',
    categories => '=Sheet1!$A$2:$A$4',
    values     => '=Sheet1!$B$2:$B$4',
);

# Add a title.
$chart->set_title( name => 'Popular Pie Types' );


# Insert the chart into the worksheet (with an offset).
$worksheet->insert_chart( 'C2', $chart, 25, 10 );

__END__

This will produce a chart that looks like this:

#AUTHOR

John McNamara jmcnamara@cpan.org